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<meta name="description" content="任务四：听指令的小方块（一）任务目的练习JavaScript在DOM、字符串处理相关知识练习对于复杂UI，如何进行数据机构建模 任务描述如图，实现一个类似棋盘的格子空间，每个格子用两个数字可以定位，一个红正方形的DOM在这个空间内，正方形中的蓝色边表示这是他的正面，有一个input输入框在输入框中允许输入如下指令，按下按钮后，使得正方形做相应动作GO：向蓝色边所面向的方向前进一格（一格等同于正方形">
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          <h1 class="post-title" itemprop="name headline">IFE JavaScript Task 2-04</h1>
        

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        <h1 id="任务四：听指令的小方块（一）"><a href="#任务四：听指令的小方块（一）" class="headerlink" title="任务四：听指令的小方块（一）"></a>任务四：听指令的小方块（一）</h1><h2 id="任务目的"><a href="#任务目的" class="headerlink" title="任务目的"></a>任务目的</h2><p>练习JavaScript在DOM、字符串处理相关知识<br>练习对于复杂UI，如何进行数据机构建模</p>
<h2 id="任务描述"><a href="#任务描述" class="headerlink" title="任务描述"></a>任务描述</h2><p>如图，实现一个类似棋盘的格子空间，每个格子用两个数字可以定位，一个红正方形的DOM在这个空间内，正方形中的蓝色边表示这是他的正面，有一个input输入框<br>在输入框中允许输入如下指令，按下按钮后，使得正方形做相应动作<br>GO：向蓝色边所面向的方向前进一格（一格等同于正方形的边长）<br>TUN LEF：向左转（逆时针旋转90度）<br>TUN RIG：向右转（顺时针旋转90度）<br>TUN BAC：向右转（旋转180度）<br>移动不能超出格子空间</p>
<h2 id="任务注意事项"><a href="#任务注意事项" class="headerlink" title="任务注意事项"></a>任务注意事项</h2><p>实现功能的同时，请仔细学习JavaScript相关的知识<br>请注意代码风格的整齐、优雅<br>代码中含有必要的注释<br>建议不使用任何第三方库、框架</p>
<a id="more"></a>
<p><em>代码如下：</em></p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span 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class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span 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class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br><span class="line">196</span><br><span class="line">197</span><br><span class="line">198</span><br><span class="line">199</span><br><span class="line">200</span><br><span class="line">201</span><br><span class="line">202</span><br><span class="line">203</span><br><span class="line">204</span><br><span class="line">205</span><br><span class="line">206</span><br><span class="line">207</span><br><span class="line">208</span><br><span class="line">209</span><br><span class="line">210</span><br><span class="line">211</span><br><span class="line">212</span><br><span class="line">213</span><br><span class="line">214</span><br><span class="line">215</span><br><span class="line">216</span><br><span class="line">217</span><br><span class="line">218</span><br><span class="line">219</span><br><span class="line">220</span><br><span class="line">221</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE html&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"utf-8"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>IFE JavaScript Task 2 - 04<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"wrapper"</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">id</span>=<span class="string">"buttons"</span>&gt;</span><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"javascript:void(0);"</span>&gt;</span>Go<span class="tag">&lt;/<span class="name">a</span>&gt;</span><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"javascript:void(0);"</span>&gt;</span>TunLeft<span class="tag">&lt;/<span class="name">a</span>&gt;</span><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"javascript:void(0);"</span>&gt;</span>TunRight<span class="tag">&lt;/<span class="name">a</span>&gt;</span><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"javascript:void(0);"</span>&gt;</span>TunBac<span class="tag">&lt;/<span class="name">a</span>&gt;</span><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span><span class="undefined"></span></span><br><span class="line"><span class="javascript"><span class="built_in">window</span>.onload = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">    (<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//外部元素样式</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> wrapperStyle = <span class="string">"position:relative;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"width:331px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"height:331px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"margin:10px;"</span>;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//表格样式</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> tableStyle = <span class="string">"border-collapse:collapse;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"border-spacing:0;"</span>;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//表格td样式</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> tdStyle = <span class="string">"width:30px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"height:30px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"padding:1px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"margin:0;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"border:1px solid #cccccc;"</span>;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//方块样式</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> blockStyle = <span class="string">"position:absolute;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"width:33px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"height:28px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"left:0px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"top:0px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"transition: all .5s;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"background:#75e5ff;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"border-bottom:5px solid #f15555;"</span>;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//按钮外部元素样式</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> buttonsWrapStyle = <span class="string">"padding:0 10px;"</span>;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//按钮样式</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> buttonsStyle = <span class="string">"display: inline-block;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"background:#ffffff;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"color:#fd6ba6;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"font-size:12px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"text-decoration:none;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"line-height:normal;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"border:1px solid #fd6ba6;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"border-radius:3px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"padding: 6px 10px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"margin:0px 5px 5px 0;"</span>;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//按钮hover样式</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> buttonsHoverStyle = <span class="string">"display: inline-block;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"background:#fd6ba6;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"color:#ffffff;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"font-size:12px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"text-decoration:none;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"line-height:normal;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"-webkit-transition: all 0.28s ease;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"transition: all 0.28s ease;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"border-radius:3px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"border:1px solid #fd6ba6;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"padding: 6px 10px;"</span> +</span></span><br><span class="line"><span class="javascript">            <span class="string">"margin:0px 5px 5px 0;"</span>;</span></span><br><span class="line"><span class="javascript">        <span class="comment">//获取按钮</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> getButtons = <span class="built_in">document</span>.getElementById(<span class="string">"buttons"</span>);</span></span><br><span class="line"><span class="javascript">        <span class="comment">//获取容器元素</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">const</span> getWrapper = $(<span class="string">"#wrapper"</span>);</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="comment">//初始角度</span></span></span><br><span class="line"><span class="javascript">        <span class="keyword">var</span> blockDeg = <span class="number">0</span>;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">$</span>(<span class="params">e</span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">return</span> <span class="built_in">document</span>.querySelector(e);</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">        /*添加样式</span></span><br><span class="line"><span class="undefined">                 */</span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">addStyle</span>(<span class="params">id, el, style</span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">let</span> els = $(id).getElementsByTagName(el);</span></span><br><span class="line"><span class="javascript">            <span class="keyword">if</span> (els.length === <span class="number">1</span>) &#123;</span></span><br><span class="line"><span class="undefined">                els[0].style.cssText = style;</span></span><br><span class="line"><span class="javascript">            &#125; <span class="keyword">else</span> &#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; els.length; i++) &#123;</span></span><br><span class="line"><span class="undefined">                    els[i].style.cssText = style;</span></span><br><span class="line"><span class="undefined">                &#125;</span></span><br><span class="line"><span class="undefined">            &#125;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="comment">//按钮增加hover样式</span></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">buttonHover</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            getButtons.addEventListener(<span class="string">"mouseover"</span>, <span class="function"><span class="keyword">function</span> (<span class="params">event</span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">if</span> (event.target.nodeName === <span class="string">"A"</span>) &#123;</span></span><br><span class="line"><span class="javascript">                    event.target.style.cssText = buttonsHoverStyle;<span class="comment">//为按钮增加样式</span></span></span><br><span class="line"><span class="undefined">                &#125;</span></span><br><span class="line"><span class="undefined">            &#125;);</span></span><br><span class="line"><span class="javascript">            getButtons.addEventListener(<span class="string">"mouseout"</span>, <span class="function"><span class="keyword">function</span> (<span class="params">event</span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">if</span> (event.target.nodeName === <span class="string">"A"</span>) &#123;</span></span><br><span class="line"><span class="javascript">                    event.target.style.cssText = buttonsStyle;<span class="comment">//为按钮增加样式</span></span></span><br><span class="line"><span class="undefined">                &#125;</span></span><br><span class="line"><span class="undefined">            &#125;);</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">createTable</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="comment">//创建table</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> _table = <span class="built_in">document</span>.createElement(<span class="string">"table"</span>);</span></span><br><span class="line"><span class="javascript">            <span class="comment">//创建tbody</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> _tbody = <span class="built_in">document</span>.createElement(<span class="string">"tbody"</span>);</span></span><br><span class="line"><span class="javascript">            <span class="comment">//获取table父元素 生成table</span></span></span><br><span class="line"><span class="undefined">            getWrapper.appendChild(_table);</span></span><br><span class="line"><span class="javascript">            <span class="comment">//获取table 生成tbdoy</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> getTable = getWrapper.getElementsByTagName(<span class="string">"table"</span>);</span></span><br><span class="line"><span class="undefined">            getTable[0].appendChild(_tbody);</span></span><br><span class="line"><span class="javascript">            <span class="comment">//获取tbody</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> getTbody = getWrapper.getElementsByTagName(<span class="string">"tbody"</span>);</span></span><br><span class="line"><span class="javascript">            <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; <span class="number">10</span>; i++) &#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">let</span> _tr = [];</span></span><br><span class="line"><span class="javascript">                _tr[i] = <span class="built_in">document</span>.createElement(<span class="string">"tr"</span>);</span></span><br><span class="line"><span class="javascript">                <span class="comment">//生成tr</span></span></span><br><span class="line"><span class="undefined">                getTbody[0].appendChild(_tr[i]);</span></span><br><span class="line"><span class="javascript">                <span class="keyword">for</span> (<span class="keyword">let</span> j = <span class="number">0</span>; j &lt; <span class="number">10</span>; j++) &#123;</span></span><br><span class="line"><span class="javascript">                    <span class="comment">//获取tr 生成td</span></span></span><br><span class="line"><span class="javascript">                    <span class="keyword">let</span> getTr = getTbody[<span class="number">0</span>].getElementsByTagName(<span class="string">"tr"</span>);</span></span><br><span class="line"><span class="javascript">                    <span class="keyword">let</span> _td = [];</span></span><br><span class="line"><span class="javascript">                    _td[j] = <span class="built_in">document</span>.createElement(<span class="string">"td"</span>);</span></span><br><span class="line"><span class="undefined">                    _tr[i].appendChild(_td[j]);</span></span><br><span class="line"><span class="undefined">                &#125;</span></span><br><span class="line"><span class="undefined">            &#125;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="comment">//创建方块</span></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">createBlock</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> _block = <span class="built_in">document</span>.createElement(<span class="string">"div"</span>);</span></span><br><span class="line"><span class="javascript">            getWrapper.appendChild(_block).id = <span class="string">"block"</span>;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="comment">//移动</span></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">Go</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="comment">//获取block</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> getBlock = $(<span class="string">"#block"</span>);</span></span><br><span class="line"><span class="javascript">            <span class="comment">//获取block边距</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> collTop = getBlock.offsetTop;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> collLeft = getBlock.offsetLeft;</span></span><br><span class="line"><span class="javascript">            <span class="comment">//获取block高度</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> BlockHeight = getBlock.offsetHeight;</span></span><br><span class="line"><span class="javascript">            <span class="comment">//获取容器高度与宽度</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> wrapHeight = getWrapper.offsetHeight - BlockHeight * <span class="number">2</span>;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">            <span class="keyword">let</span> _blockDeg = blockDeg;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">            <span class="comment">//如果角度是负值，取正</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">while</span> (_blockDeg &lt; <span class="number">0</span>) &#123;</span></span><br><span class="line"><span class="undefined">                _blockDeg = _blockDeg + 360;</span></span><br><span class="line"><span class="undefined">            &#125;</span></span><br><span class="line"><span class="javascript">            <span class="keyword">if</span> (_blockDeg % <span class="number">360</span> === <span class="number">270</span> &amp;&amp; collLeft &lt; wrapHeight) &#123;<span class="comment">//右移</span></span></span><br><span class="line"><span class="javascript">                getBlock.style.left = collLeft + BlockHeight + <span class="string">"px"</span>;</span></span><br><span class="line"><span class="javascript">                <span class="built_in">console</span>.log(<span class="string">"右移"</span>);</span></span><br><span class="line"><span class="javascript">            &#125; <span class="keyword">else</span> <span class="keyword">if</span> (_blockDeg % <span class="number">360</span> === <span class="number">0</span> &amp;&amp; collTop &lt; wrapHeight) &#123;<span class="comment">//下移</span></span></span><br><span class="line"><span class="javascript">                getBlock.style.top = collTop + BlockHeight + <span class="string">"px"</span>;</span></span><br><span class="line"><span class="javascript">                <span class="built_in">console</span>.log(<span class="string">"下移"</span>);</span></span><br><span class="line"><span class="javascript">            &#125; <span class="keyword">else</span> <span class="keyword">if</span> (_blockDeg % <span class="number">360</span> === <span class="number">90</span> &amp;&amp; collLeft &gt; <span class="number">0</span>) &#123;<span class="comment">//左移</span></span></span><br><span class="line"><span class="javascript">                getBlock.style.left = (collLeft - BlockHeight) + <span class="string">"px"</span>;</span></span><br><span class="line"><span class="javascript">                <span class="built_in">console</span>.log(<span class="string">"左移"</span>);</span></span><br><span class="line"><span class="javascript">            &#125; <span class="keyword">else</span> <span class="keyword">if</span> (_blockDeg % <span class="number">360</span> === <span class="number">180</span> &amp;&amp; collTop &gt; <span class="number">0</span>) &#123;<span class="comment">//上移</span></span></span><br><span class="line"><span class="javascript">                getBlock.style.top = (collTop - BlockHeight) + <span class="string">"px"</span>;</span></span><br><span class="line"><span class="javascript">                <span class="built_in">console</span>.log(<span class="string">"上移"</span>);</span></span><br><span class="line"><span class="javascript">            &#125; <span class="keyword">else</span> &#123;</span></span><br><span class="line"><span class="javascript">                setTimeout(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">                    alert(<span class="string">"不能超过边界！"</span>);</span></span><br><span class="line"><span class="undefined">                &#125;, 200)</span></span><br><span class="line"><span class="undefined">            &#125;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="comment">//block旋转</span></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">tun</span>(<span class="params">deg, b</span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            <span class="comment">//获取block</span></span></span><br><span class="line"><span class="javascript">            <span class="keyword">const</span> getBlock = $(<span class="string">"#block"</span>);</span></span><br><span class="line"><span class="javascript">            <span class="keyword">if</span> (b === <span class="literal">true</span>) &#123;</span></span><br><span class="line"><span class="undefined">                blockDeg = blockDeg - deg;</span></span><br><span class="line"><span class="javascript">            &#125; <span class="keyword">else</span> <span class="keyword">if</span> (b === <span class="literal">false</span>) &#123;</span></span><br><span class="line"><span class="undefined">                blockDeg = blockDeg + deg;</span></span><br><span class="line"><span class="undefined">            &#125;</span></span><br><span class="line"><span class="javascript">            getBlock.style.transform = <span class="string">"rotate("</span> + blockDeg + <span class="string">"Deg)"</span>;</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="comment">//绑定事件</span></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">addListener</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="javascript">            getButtons.addEventListener(<span class="string">"click"</span>, event =&gt; &#123;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">if</span> (event.target.innerHTML === <span class="string">"Go"</span>) &#123;</span></span><br><span class="line"><span class="undefined">                    Go();</span></span><br><span class="line"><span class="undefined">                &#125;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">if</span> (event.target.innerHTML === <span class="string">"TunLeft"</span>) &#123;</span></span><br><span class="line"><span class="javascript">                    tun(<span class="number">90</span>, <span class="literal">true</span>);</span></span><br><span class="line"><span class="undefined">                &#125;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">if</span> (event.target.innerHTML === <span class="string">"TunRight"</span>) &#123;</span></span><br><span class="line"><span class="javascript">                    tun(<span class="number">90</span>, <span class="literal">false</span>);</span></span><br><span class="line"><span class="undefined">                &#125;</span></span><br><span class="line"><span class="javascript">                <span class="keyword">if</span> (event.target.innerHTML === <span class="string">"TunBac"</span>) &#123;</span></span><br><span class="line"><span class="javascript">                    tun(<span class="number">180</span>, <span class="literal">false</span>);</span></span><br><span class="line"><span class="undefined">                &#125;</span></span><br><span class="line"><span class="undefined">            &#125;)</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="javascript">        <span class="function"><span class="keyword">function</span> <span class="title">init</span>(<span class="params"></span>) </span>&#123;</span></span><br><span class="line"><span class="undefined">            createTable();</span></span><br><span class="line"><span class="undefined">            createBlock();</span></span><br><span class="line"><span class="javascript">            <span class="comment">//添加样式</span></span></span><br><span class="line"><span class="javascript">            $(<span class="string">"#wrapper"</span>).style.cssText = wrapperStyle;</span></span><br><span class="line"><span class="undefined">            getButtons.style.cssText = buttonsWrapStyle;</span></span><br><span class="line"><span class="javascript">            addStyle(<span class="string">"#wrapper"</span>, <span class="string">"table"</span>, tableStyle);</span></span><br><span class="line"><span class="javascript">            addStyle(<span class="string">"#wrapper"</span>, <span class="string">"td"</span>, tdStyle);</span></span><br><span class="line"><span class="javascript">            addStyle(<span class="string">"#wrapper"</span>, <span class="string">"div"</span>, blockStyle);</span></span><br><span class="line"><span class="javascript">            addStyle(<span class="string">"#buttons"</span>, <span class="string">"a"</span>, buttonsStyle);</span></span><br><span class="line"><span class="undefined">            buttonHover();</span></span><br><span class="line"><span class="undefined">            addListener();</span></span><br><span class="line"><span class="undefined">        &#125;</span></span><br><span class="line"><span class="undefined"></span></span><br><span class="line"><span class="undefined">        init();</span></span><br><span class="line"><span class="undefined">    &#125;())</span></span><br><span class="line"><span class="undefined">&#125;</span></span><br><span class="line"><span class="undefined"></span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p><em>Demo如下：</em></p>
<script>
window.onload = function () {
    (function () {
        //外部元素样式
        const wrapperStyle = "position:relative;" +
            "width:331px;" +
            "height:331px;" +
            "margin:10px;";
        //表格样式
        const tableStyle = "border-collapse:collapse;" +
            "border-spacing:0;";
        //表格td样式
        const tdStyle = "width:30px;" +
            "height:30px;" +
            "padding:1px;" +
            "margin:0;" +
            "border:1px solid #cccccc;";
        //方块样式
        const blockStyle = "position:absolute;" +
            "width:33px;" +
            "height:28px;" +
            "left:0px;" +
            "top:0px;" +
            "transition: all .5s;" +
            "background:#75e5ff;" +
            "border-bottom:5px solid #f15555;";
        //按钮外部元素样式
        const buttonsWrapStyle = "padding:0 10px;";
        //按钮样式
        const buttonsStyle = "display: inline-block;" +
            "background:#ffffff;" +
            "color:#fd6ba6;" +
            "font-size:12px;" +
            "text-decoration:none;" +
            "line-height:normal;" +
            "border:1px solid #fd6ba6;" +
            "border-radius:3px;" +
            "padding: 6px 10px;" +
            "margin:0px 5px 5px 0;";
        //按钮hover样式
        const buttonsHoverStyle = "display: inline-block;" +
            "background:#fd6ba6;" +
            "color:#ffffff;" +
            "font-size:12px;" +
            "text-decoration:none;" +
            "line-height:normal;" +
            "-webkit-transition: all 0.28s ease;" +
            "transition: all 0.28s ease;" +
            "border-radius:3px;" +
            "border:1px solid #fd6ba6;" +
            "padding: 6px 10px;" +
            "margin:0px 5px 5px 0;";
        //获取按钮
        const getButtons = document.getElementById("buttons");
        //获取容器元素
        const getWrapper = $("#wrapper");

        //初始角度
        var blockDeg = 0;

        function $(e) {
            return document.querySelector(e);
        }

        /*添加样式
                 */
        function addStyle(id, el, style) {
            let els = $(id).getElementsByTagName(el);
            if (els.length === 1) {
                els[0].style.cssText = style;
            } else {
                for (let i = 0; i < els.length; i++) {
                    els[i].style.cssText = style;
                }
            }
        }

        //按钮增加hover样式
        function buttonHover() {
            getButtons.addEventListener("mouseover", function (event) {
                if (event.target.nodeName === "A") {
                    event.target.style.cssText = buttonsHoverStyle;//为按钮增加样式
                }
            });
            getButtons.addEventListener("mouseout", function (event) {
                if (event.target.nodeName === "A") {
                    event.target.style.cssText = buttonsStyle;//为按钮增加样式
                }
            });
        }

        function createTable() {
            //创建table
            const _table = document.createElement("table");
            //创建tbody
            const _tbody = document.createElement("tbody");
            //获取table父元素 生成table
            getWrapper.appendChild(_table);
            //获取table 生成tbdoy
            const getTable = getWrapper.getElementsByTagName("table");
            getTable[0].appendChild(_tbody);
            //获取tbody
            const getTbody = getWrapper.getElementsByTagName("tbody");
            for (let i = 0; i < 10; i++) {
                let _tr = [];
                _tr[i] = document.createElement("tr");
                //生成tr
                getTbody[0].appendChild(_tr[i]);
                for (let j = 0; j < 10; j++) {
                    //获取tr 生成td
                    let getTr = getTbody[0].getElementsByTagName("tr");
                    let _td = [];
                    _td[j] = document.createElement("td");
                    _tr[i].appendChild(_td[j]);
                }
            }
        }

        //创建方块
        function createBlock() {
            const _block = document.createElement("div");
            getWrapper.appendChild(_block).id = "block";
        }

        //移动
        function Go() {
            //获取block
            const getBlock = $("#block");
            //获取block边距
            const collTop = getBlock.offsetTop;
            const collLeft = getBlock.offsetLeft;
            //获取block高度
            const BlockHeight = getBlock.offsetHeight;
            //获取容器高度与宽度
            const wrapHeight = getWrapper.offsetHeight - BlockHeight * 2;

            let _blockDeg = blockDeg;

            //如果角度是负值，取正
            while (_blockDeg < 0) {
                _blockDeg = _blockDeg + 360;
            }
            if (_blockDeg % 360 === 270 && collLeft < wrapHeight) {//右移
                getBlock.style.left = collLeft + BlockHeight + "px";
                console.log("右移");
            } else if (_blockDeg % 360 === 0 && collTop < wrapHeight) {//下移
                getBlock.style.top = collTop + BlockHeight + "px";
                console.log("下移");
            } else if (_blockDeg % 360 === 90 && collLeft > 0) {//左移
                getBlock.style.left = (collLeft - BlockHeight) + "px";
                console.log("左移");
            } else if (_blockDeg % 360 === 180 && collTop > 0) {//上移
                getBlock.style.top = (collTop - BlockHeight) + "px";
                console.log("上移");
            } else {
                setTimeout(function () {
                    alert("不能超过边界！");
                }, 200)
            }
        }

        //block旋转
        function tun(deg, b) {
            //获取block
            const getBlock = $("#block");
            if (b === true) {
                blockDeg = blockDeg - deg;
            } else if (b === false) {
                blockDeg = blockDeg + deg;
            }
            getBlock.style.transform = "rotate(" + blockDeg + "Deg)";
        }

        //绑定事件
        function addListener() {
            getButtons.addEventListener("click", event => {
                if (event.target.innerHTML === "Go") {
                    Go();
                }
                if (event.target.innerHTML === "TunLeft") {
                    tun(90, true);
                }
                if (event.target.innerHTML === "TunRight") {
                    tun(90, false);
                }
                if (event.target.innerHTML === "TunBac") {
                    tun(180, false);
                }
            })
        }

        function init() {
            createTable();
            createBlock();
            //添加样式
            $("#wrapper").style.cssText = wrapperStyle;
            getButtons.style.cssText = buttonsWrapStyle;
            addStyle("#wrapper", "table", tableStyle);
            addStyle("#wrapper", "td", tdStyle);
            addStyle("#wrapper", "div", blockStyle);
            addStyle("#buttons", "a", buttonsStyle);
            buttonHover();
            addListener();
        }

        init();
    }())
}
</script>

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